Plot hole: At the training sequence, where Anne Marie is running on the sea floor. When they get up, suddenly their surfboards turn up out of nowhere (they didn't have them tied to their ankles, because we would've seen that in the underwater-shots)
Plot hole: Michael Jordan is from North Carolina. If those were really his shoes, how did they make their way to L.A?
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Suggested correction: That might sound impossible to you, but in fact, it's not impossible that this would happen. This is not in any way a plot hole.